WO2021234759A1 - 塊成物の製造方法および塊成物 - Google Patents
塊成物の製造方法および塊成物 Download PDFInfo
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- WO2021234759A1 WO2021234759A1 PCT/JP2020/019568 JP2020019568W WO2021234759A1 WO 2021234759 A1 WO2021234759 A1 WO 2021234759A1 JP 2020019568 W JP2020019568 W JP 2020019568W WO 2021234759 A1 WO2021234759 A1 WO 2021234759A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a method for producing a lump product and a lump product produced by the above-mentioned production method.
- Iron-containing substances such as dust or sludge generated in the iron-making process are being reused as an iron source in the steel-making plant from the viewpoint of effective use of resources and environmental problems.
- This iron-containing material is often reused in the sintering process, but those containing a large amount of metallic iron are agglomerates obtained by processing into pellets or briquettes (also referred to as "granulated products"). As a result, it may be reused in the ironmaking process (blast furnace, etc.) and steelmaking process (converter, etc.).
- Patent Document 1 describes a method in which ⁇ -starch and dextrin are used as a binder when the pH of a raw material containing an iron-containing substance is less than 10.5, and dextrin is used when the pH of the raw material is 10.5 or more. Proposed.
- One aspect of the present invention is to realize a method for producing a high-strength agglomerate using starch as a binder when the pH of the iron-containing material is 10 or more.
- the method for producing an agglomerate is a method for producing an agglomerate, which comprises a step of mixing an iron-containing raw material and a binder, and contains the iron.
- a binder having a pH of 10 or more is used, and at least one selected from the group consisting of etherified starch and non-esterified starch is selected as the binder.
- the lump product according to one aspect of the present invention is a lump product having an iron-containing raw material and a binder, and the iron-containing raw material has a pH of 10 or more.
- the binder is at least one selected from the group consisting of non-esterified starch and etherified starch.
- the pH of the iron-containing material is 10 or more, it is possible to realize a method for producing a high-strength agglomerate using starch as a binder.
- FIG. 1 It is a figure which shows the particle size of the raw material which concerns on one Example of this invention. It is a figure which shows the particle size of the binder which concerns on one Example of this invention.
- (A) and (b) are diagrams showing the relationship between the crushing strength of the agglomerate according to the embodiment of the present invention and the granulated water content. It is a figure which shows the relationship between pH and viscosity in the binder which concerns on one Example of this invention. It is a figure which shows the analysis result of the functional group contained in the binder which concerns on one Example of this invention.
- an iron-containing material is used as a raw material
- the mixture is prepared by a step of mixing the raw material (iron-containing raw material) and a binder, and then the mixture is pelleted or used. Process into briquettes to make agglomerates. Water or the like may be further mixed with the mixture.
- the lump product may be used in a hot metal making process, a steel making process, or the like.
- the mixing method and processing method are not particularly limited, and may be performed according to a method known in the art. Further, after processing into pellets or briquettes, a drying treatment may be performed.
- the iron-containing substance is not particularly limited, but it is preferable to use an iron-containing by-product generated in the iron-making process from the viewpoint of effective use of resources and environmental problems.
- the iron-containing by-products generated in the iron-making process are not particularly limited, and examples thereof include dust, sludge, scale, and bare metal. These can be used alone or in combination of a plurality of kinds as the raw materials.
- the binder it is preferable to use an organic binder having a relatively low slag content such as SiO 2 and Al 2 O 3.
- Starch which is a kind of such an organic binder, is generally used as a binder from the viewpoint of easy availability, but it does not dissolve in cold water as it is. Therefore, it is preferable to select modified starch modified by an enzyme or heat as a binder.
- the starch according to the present embodiment is preferably etherified starch or non-esterified starch, and starch which is an etherified starch and a non-esterified starch (hereinafter referred to as "etherified / non-esterified starch") is used. More preferred.
- starch which is at least one selected from the group consisting of etherified starch and non-esterified starch is preferable.
- Ethered starch is starch in which a functional group is bonded to the hydroxyl group of a glucose residue by an ether bond.
- the functional group bonded to such etherified starch include hydroxyalkyl groups having 1 to 10 carbon atoms.
- the number of carbon atoms of the hydroxyalkyl group may be 1 or more, 9 or less, 8 or less, 7 or less, 6 or less, and 5 It may be less than or equal to, 4 or less, or 3 or less.
- hydroxyalkyl group examples include, but are limited to, at least one functional group selected from the group consisting of a hydroxypropyl group, a hydroxymethyl group, a hydroxyethyl group, a hydroxybutyl group, and a hydroxypentyl group.
- the etherified starch is not limited to this, and may be starch in which any functional group is bonded by an ether bond.
- the content of the hydroxyalkyl group in the etherified starch is preferably 1% by weight or more, preferably 1.5% by weight or more in terms of dry matter. It is more preferably 2.0% by weight or more, more preferably 2.5% by weight or more, more preferably 3.0% by weight or more, and 3.5% by weight. The above is more preferable, 4.0% by weight or more is more preferable, 4.5% by weight or more is more preferable, and 5.0% by weight or more is more preferable.
- the content of the hydroxyalkyl group is measured by a titration method.
- a method for measuring the content of a hydroxyalkyl group by a titration method will be described in detail by taking as an example a method for measuring the content of a hydroxypropyl group.
- the non-esterified starch is starch in which the functional group due to the ester bond is not bonded to the hydroxyl group of the glucose residue, or the ratio of the functional group due to the ester bond is extremely small (preferably below the measurement limit).
- the functional group bonded to the hydroxyl group by the ester bond include, but are not limited to, an acetyl group and a carboxyl group.
- the non-esterified starch according to the present embodiment preferably has a content of both acetyl groups and carboxyl groups of less than 0.3% by weight in terms of dry matter, and is 0.2% by weight or less. Is more preferable, and 0.1% by weight or less is more preferable.
- the content of acetyl group and carboxyl group in the esterified starch is measured by a titration method. The titration method will be described in detail in Examples described later.
- starch tends to decrease in viscosity under high pH conditions (for example, under conditions of pH 10 or higher).
- high pH conditions for example, under conditions of pH 10 or higher.
- the performance as a binder also deteriorates, so that the starch whose viscosity decreases under high pH conditions is not preferable as a binder.
- the viscosity of etherified starch, non-esterified starch, and etherified / non-esterified starch does not easily decrease under high pH conditions. This is because the ether bond is more stable than the ester bond under high pH conditions. That is, under high pH conditions, the functional group bonded by the ester bond becomes unstable, but the functional group bonded by the ether bond can exist stably. Therefore, etherified starch, non-esterified starch, or etherified / non-esterified starch can maintain the properties of modified starch regardless of the increase in pH, so that the viscosity does not easily decrease even under high pH conditions.
- the raw material of the agglomerate has various properties depending on the type of the iron-making process.
- performance such as viscosity in the binder is affected by the pH of the raw material.
- the case where the raw material has a high pH may be a case where the pH is 12.5 or more when 1 g of the raw material is put into 100 mL of pure water and the pH is measured with a commercially available pH meter. It may be 12 or more, 11.5 or more, 11 or more, 10.5 or more, or 10 or more. May be. Even when the raw material has such a high pH, the starch according to the present embodiment can be used as a binder for producing agglomerates without any problem.
- the binder is preferably etherified starch, non-esterified starch, or etherified / non-esterified starch to be further pregelatinized ⁇ -starch, or may be further dextrinized dextrin or the like.
- dextrin there are several types of dextrin, such as roasted dextrin produced by heating starch at 100 to 200 ° C. and dextrinized with an acid or an enzyme, but any of them may be used.
- the amount of the binder added is not particularly limited as long as the raw material can be processed into pellets or briquettes and agglomerated, and may be appropriately adjusted according to the type of the binder.
- modified starch is used as a binder, the amount added thereof is preferably 0.5 to 5 parts by mass, more preferably 1 to 3 parts by mass with respect to 100 parts by mass of the raw material.
- raw materials X and Y which are iron-containing by-products generated in the iron-making process, were used to produce agglomerates (hereinafter, may be referred to as “samples”).
- Table 1 shows the chemical composition of the raw material X and the raw material Y.
- the pH of the raw material X was 9.2, and the pH of the raw material Y was 12.8.
- 1 g of the raw material was added to 100 mL of pure water, and the pH was measured with a commercially available pH meter. Further, as shown in FIG. 1, the particle size of the raw material was smaller in the raw material X than in the raw material Y.
- ⁇ -starch A As the binder, ⁇ -starch A, ⁇ -starch B, and ⁇ -starch C, which are three different types of ⁇ -starch, were used. Table 2 below shows the physical characteristics of these ⁇ -starches.
- ⁇ -starch The three types of ⁇ -starch are commercially available modified starch for foods purchased from Ingredion Japan. Each ⁇ -starch is made from tapioca, but the chemical treatment method before pregelatinization is different. No significant difference was found between each ⁇ -starch in terms of chemical composition and molecular weight dispersion. Further, as shown in FIG. 2, no particular difference was observed in the particle size of each ⁇ -starch.
- the raw material Y which is a high pH raw material, is the sample No. Although not included in 1 to 3, sample No. 4 to 6 contains 20% by mass. Further, under any of the conditions, any of the binders is contained in an external number of 2% by mass. Granulation moisture was carried out under multiple conditions so as to be within the numerical range described in the table.
- ⁇ -starch A, ⁇ -starch B, and ⁇ -starch C were each dissolved in pure water (pH 7.0) or alkaline water (pH 11.8), and the viscosities were measured.
- alkaline water was prepared by adding a NaOH reagent to pure water so as to have a pH of 11.8.
- the starch was dissolved so that ⁇ -starch A was 40% by mass, ⁇ -starch B was 17% by mass, and ⁇ -starch C was 15% by mass.
- the viscosity was measured using a Brookfield type viscometer manufactured by Eiko Seiki, using LV3 as the spindle, under the conditions of a spindle speed of 20 rpm and a solvent temperature of 20 to 25 ° C.
- acetyl group was carried out as follows. 5 g of dried ⁇ -starch was added to 100 mL of pure water and suspended. A few drops of the phenolphthalein test solution were added, and the sodium hydroxide solution was added dropwise until the solution turned slightly red. Next, 25 mL of 0.45 mol / L sodium hydroxide solution was added, the stopper was closed, and the mixture was vigorously shaken for 30 minutes to prepare a test solution. An excessive amount of sodium hydroxide in the test solution was titrated with 0.2 mol / L hydrochloric acid, and the consumption thereof was defined as “S” mL. The end point of the titration was the time when the slightly red color of the liquid disappeared.
- the gelatinized sample was taken out of the bath and titrated with a 0.1 mol / L sodium hydroxide solution while still hot, and the consumption was defined as "S" mL.
- the indicator at this time was 3 drops of phenolphthalein test solution.
- 3 g of dried ⁇ -starch was added to 10 mL of 80% by volume ethanol solution and suspended, the suspension stirred for 30 minutes was suction-filtered, and the residue on the filter paper was added to 200 mL of 80% by volume ethanol solution. washed. 300 mL of 80% by volume ethanol solution was added to the residue and suspended, and the operation was carried out in the same manner as in this test, and the consumption was set to "B" mL. Then, the content of the carboxyl group contained in each ⁇ -starch was determined by the following formula (2).
- the hydroxypropyl group was measured as follows. To 0.1 g of dried ⁇ -starch, 25 mL of sulfuric acid diluted 36-fold was added, heated in a water bath to dissolve, cooled, and then made into 100 mL with pure water to prepare a sample solution. The sample solution was diluted as necessary so that the concentration of the hydroxypropyl group did not exceed 4 mg / 100 mL. 8 mL of sulfuric acid was added dropwise while cooling 1 mL of the sample solution. After stirring, the mixture was heated in a water bath for 3 minutes and ice-cooled.
- ninhydrin test solution for modified starch was added, and the mixture was immediately shaken and allowed to stand in a water bath at 25 ° C. for 100 minutes. Sulfuric acid was added to make 25 mL, and the suspended product was used as a test solution, and the absorbance at 590 nm with respect to the control solution was measured.
- the control solution was prepared by operating in the same manner as in the case of the test solution, using unmodified starch based on the same plant as the ⁇ -starch of the sample.
- Table 4 shows the results of measuring the content (% by weight) of each functional group in each ⁇ -starch in terms of dry matter according to these measurement methods.
- ⁇ -starch A and ⁇ -starch B contained 5% by weight or more of hydroxypropyl groups, whereas ⁇ -starch C did not detect hydroxypropyl groups (below the detection limit). .. From this result, it was confirmed that ⁇ -starch A and ⁇ -starch B are etherified starches having a hydroxyalkyl group, and more specifically, hydroxypropylated starches.
- the method for producing an agglomerate according to one aspect of the present invention is a method for producing an agglomerate, which comprises a step of mixing an iron-containing raw material and a binder, wherein the iron-containing raw material has a pH of 10 or more. At least one selected from the group consisting of etherified starch and non-esterified starch is selected as the binder.
- the binder containing the etherified starch having a hydroxyalkyl group having 1 or more and 10 or less carbon atoms may be selected.
- the binder containing the etherified starch having the hydroxyalkyl group content of 1% by weight or more in terms of dry matter may be selected.
- the binder containing the non-esterified starch having a content of both acetyl groups and carboxyl groups of 0.1% by weight or less in terms of dry matter is selected. You may.
- the non-esterified starch and the etherified starch may be pregelatinized.
- the lump product according to one aspect of the present invention is a lump product having an iron-containing raw material and a binder, the iron-containing raw material has a pH of 10 or more, and the binder is a non-esterified starch. And at least one selected from the group consisting of etherified starch.
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Abstract
Description
本発明の一実施形態に係る塊成物の製造方法は、鉄含有物を原料として用い、前記原料(鉄含有原料)とバインダーとを混合する工程により混合物を調整した後、前記混合物をペレットまたはブリケットに加工して塊成物とする。なお、前記混合物にはさらに、水などを混合してもよい。当該塊成物は、製銑工程および製鋼工程等において用いられてよい。
本実施形態に係る澱粉としては、エーテル化澱粉または非エステル化澱粉であることが好ましく、エーテル化澱粉かつ非エステル化澱粉である澱粉(以下、「エーテル化/非エステル化澱粉」と称する)がより好ましい。言い換えれば、前記化工澱粉としては、エーテル化澱粉および非エステル化澱粉からなる群より選ばれる少なくとも一つである澱粉が好ましい。
原料として、製鉄プロセスで発生する鉄含有副産物である原料Xおよび原料Yを用いて、塊成物(以下、「サンプル」と称することがある)の製造を行った。以下の表1に、原料Xおよび原料Yの化学成分組成を示す。
α澱粉A、α澱粉B、およびα澱粉Cをバインダーとして使用した場合、α澱粉Cのみが原料が高pHである影響を顕著に受けたため、その原因を検討した。
ここで、α澱粉A、α澱粉B、およびα澱粉Cはα化される前の化学処理方法が異なることから、それぞれ付加されている官能基が異なると考えられる。それぞれのα澱粉に付加されている官能基の違いが、高pH条件下における粘度に影響していると仮定し、FT-IR(フーリエ変換赤外分光光度計)による各α澱粉の官能基分析を行った。当該分析の結果について、図5に示す。
次に、滴定法によって各α澱粉のアセチル基、カルボキシル基、およびヒドロキシプロピル基の含有量を測定した。
塊成物の製造において、高pH原料である原料Yが含まれる原料を用いた場合でも、バインダーとしてα澱粉Aおよびα澱粉Bを用いれば、α澱粉Cを用いた場合と比較して、得られたサンプルの圧潰強度は良好であった。これは、α澱粉Aおよびα澱粉Bが非エステル化澱粉であること、非酸化澱粉であること、またはエーテル化澱粉であることに起因していることが、前記のα澱粉A、α澱粉B、およびα澱粉Cの官能基含有量測定結果により示された。
本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。
Claims (6)
- 鉄含有原料とバインダーとを混合する工程を含む、塊成物の製造方法であって、
前記鉄含有原料として、pHが10以上のものを用い、
エーテル化澱粉および非エステル化澱粉からなる群より選ばれる少なくとも一つを前記バインダーとして選択する、塊成物の製造方法。 - 炭素数1以上10以下のヒドロキシアルキル基を有する前記エーテル化澱粉を含んだ前記バインダーを選択する、請求項1に記載の塊成物の製造方法。
- 前記ヒドロキシアルキル基の含有量が乾燥物換算で1重量%以上である前記エーテル化澱粉を含んだ前記バインダーを選択する、請求項2に記載の塊成物の製造方法。
- アセチル基およびカルボキシル基の含有量がいずれも乾燥物換算で0.1重量%以下である前記非エステル化澱粉を含んだ前記バインダーを選択する、請求項1から3の何れか1項に記載の塊成物の製造方法。
- 前記非エステル化澱粉および前記エーテル化澱粉は、α化されている、請求項1から4の何れか1項に記載の塊成物の製造方法。
- 鉄含有原料とバインダーとを有する塊成物であって、
前記鉄含有原料は、pHが10以上のものであり、
前記バインダーは、非エステル化澱粉およびエーテル化澱粉からなる群より選ばれる少なくとも一つである、塊成物。
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KR20180119178A (ko) | 2017-04-24 | 2018-11-02 | 라온시큐어(주) | 인증체인 기반 fido 및 인증서 등록 방법 및 장치 |
CN110306364A (zh) * | 2019-07-24 | 2019-10-08 | 广东汇美淀粉科技有限公司 | 一种淀粉复合增稠剂及其制备方法 |
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2020
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- 2020-05-18 CN CN202080098308.8A patent/CN115279928B/zh active Active
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JP2001214222A (ja) * | 2000-01-31 | 2001-08-07 | Oji Cornstarch Co Ltd | 製鋼ダスト塊成及びその製造方法 |
CN101008046A (zh) * | 2006-01-25 | 2007-08-01 | 周德聪 | 一种用于生产球团矿的粘结剂及其制备方法 |
CN103667692A (zh) * | 2014-01-02 | 2014-03-26 | 嘉峪关市园通新型保温材料有限责任公司 | 一种组合型萤石粉球团粘合剂及其应用 |
JP2016160451A (ja) * | 2015-02-27 | 2016-09-05 | 日新製鋼株式会社 | 炭材内装鉱の製造方法 |
JP2018119178A (ja) * | 2017-01-25 | 2018-08-02 | 日新製鋼株式会社 | 製鋼用塊成物の製造方法 |
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